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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92eb52eed76b8c5450c2a3453afd3020315297e53a5a9c74443ac5e64279fd92' 
  AND token = '14v/COzgrl8glNIOcmDkQ61asmQtSXfLr6VwHRpecH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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