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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0922aeb218ca8793e86acfaf4b1e2987872fa8b71f01dc0b77314d49741347' 
  AND token = 'zjjPCsorAagRb67e+YnaGFKso1feJ83IssPROkexY7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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