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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b3c0059f9bc9435be71af8df5c2a61040921f56f4f02016ae3d19e0eee3c6d' 
  AND token = 'TU95BS8Jv6tsepP4msYEz8qX4U59x6RT+Ux3ReOU8aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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