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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14bea01fec08b82ca7b90e65900530e6f3a5bfbc3a261194c82eb7f2eef9cd7' 
  AND token = '6qzWTop54F4dXzhMc2Xh6FJBiwk9EPf58jyUAUK1A9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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