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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f387d8611a09f75afd4610ee710ae1c5872d700c8ac1eae8768461812aeb601a' 
  AND token = 'XK05T8z24H0JRiEO4iX+qNl3/W5087Np6hS4PDKsujw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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