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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29cdfd078f9bb4bddb58db903891bf5c264759ed989693d18f12adf2dcc770f5' 
  AND token = '6YbaRvQNZ1AIXTN1V9p8yMwoIrOEVrb+ETMELYF4+FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}