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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b5e1ef4569e4485f4c0ef772233c3ea7e93d05fbae8443c0fe99b2d90c856e' 
  AND token = '4dA+tXEdyUot69l2UVzvwNuxezN5KOp+8qxEOb21BjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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