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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751e780622819a50b7b6a6b6bc0c2f41de6c533091873fc00cce57e05b0c940d' 
  AND token = 'hhWOeb/DmzOB1KdFYn6gRFlIi4RBy8Ei5kOjYkIRWLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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