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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32f5556c5a7c01c6f2c03fbd243b0dc5425371ed07250efb886b849cfd1b1f1' 
  AND token = 'XuIWjLLNsEX4b+Z/aP6E+qMVZhBmEZfhB5SM/nmQNaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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