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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186986a1ce39547d084d3730b41ac7b796a9325f353164dc451d65cc7ab318c0' 
  AND token = 'L5BJqw1t+71nMnnQrHQeBAPG+eYAUEVbdOSKf+JkZ68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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