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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99486b3c5e610d89f76de05e6df1a290cf3538916e8f9f14f882b6b4aed465d' 
  AND token = 'oOAZMz2ZOl+KW+FUaZIf8EVLuZJ9ToRcsSSnvXGwJ14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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