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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5897d0b1c6a300d957f304e2d944d5de2572ed36316881632fde408a2968271' 
  AND token = 'zN3ljOUHXniKIjNnImAr519X5SpXmoyyjnQlPnzF+nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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