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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb94f57362cacf7fffb2dd3ff7c7a5ee67fb338ce5b36bf62d589273bb7de2e' 
  AND token = 'jc2Was6sTsOkO8/RxyowyvE5HoMJdOBOtHVkx7so5H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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