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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e182fa0ed501764f5e181872eae574f1c3a2816fcabad35249a7fe0bbd410bc' 
  AND token = 'pkn844PYfIlF6axOn3cA9ikIqhlXbwtuqebkkpIGipQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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