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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc8e2121dce8a218a63c84522a9799e05b2edc887a33493dec9b3a90b31dab1' 
  AND token = 'oFmeibsHHSDZAaeGBdUrzKe0ONUVKWbeon0n+0Z3yw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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