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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83314c326b8c804f849d69360defe1348d0d8f5a0a043cb2ca6bcc722c7a39cb' 
  AND token = 'bbNfyeI5ptP8ERazd+Z58pt/ixRvueGs4gX8SjJAmM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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