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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c19df2e83461f11eeef835b681a9c12fbe90230792ea734097408810b9f0dfa' 
  AND token = 'N5eKhmbjKISetAcj1YG+JY6b2PetgTgCikv0eSstmUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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