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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b91deeff3315e2ded27063ca00c8036e0fa6ded473a22a76bc25c09b45fd27' 
  AND token = '+0RXgStYbcg+oSQF7x++IwgoYlGwAXXMo236xvqPezo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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