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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa5f0cb79b506832ac4f8e41e8dc425608c4c8de0645142fcb0cea17029d4e1' 
  AND token = '6trDqwkuQ2758Rysteil2WKMtTdH673AVaq4H9182uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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