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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac59717168a66b14248107a8480187782867b497791c9a51b824066281a0a111' 
  AND token = 'W7LUSpR+2IQ8aFiwkka/Ud/1G+ZP91+OoA0S5RkUTY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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