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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092cc0db62b65c66af4b4a33d49b4d6604d18a160061a92397c916e6824b41ee' 
  AND token = 'b2k99yURxyGVsk5zmDLRrfJZpB6PDY0WVV3/lo+pSI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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