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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1282e51778939baac87b6e6e14a0b2397578728eb8440b118ab1fa886c3feccc' 
  AND token = 'zYF5R2d6Y/nD4M0R1IxtqH1iV1fUE/l1R6ccmN5N+EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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