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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a33a8637e88c859bb43608c66838133f9a82abe757fae639c46bbbb47ac9712' 
  AND token = 'g6wpy1ZyeiDSUUtK+CZN8qR+osRRBO2Shc5zhqEXknc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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