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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13949353db5c593322d6eca7a7f7df1887694c79dd80e7fb1d10662d793f0cae' 
  AND token = '8x+1LsXNJLA+4GjqZIPMfAb27Ec9NdJdgAZvu07JlSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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