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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fa74f32e92b15afe3faf94e5eb87fa12d6f5ddd57f352271a4478d3b425443' 
  AND token = '8CiJPzJBKjsChde1xKHKMNJaDq8KwMInwSEXu71FOQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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