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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31cfabd6c6eccd88d1fe59beb7a7ecdfbfb8a8692a30c537dc330be96e10c46' 
  AND token = 'm1ggDSYa/bsM8elU4GzIEb58Gf9t9j2A2n5smJb22T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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