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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76abc8079a8cbc11dd46cd9f43440e59c21cb778d0aa19a454de8de2684caf7' 
  AND token = 'k66PpYjGQoebeQYkx5ZQJ6Tv5iw6ORKBvmK18Y1MKzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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