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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2ce36a54eb9b12342f822a32e74d32902dc9717bf16a8b6215c45aa1ca7bb6' 
  AND token = 'YR0gCO7rQ0SZJ21yrGFKZFQHWrvK2w+2mftv0wf1DW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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