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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1342caf6a6a3ff7f8fa0ce19068e4d0b7c8e0dc3ad35a9ac58d507409ea9ed3' 
  AND token = 'GjavfUWtIR6dEZoqT8FcimSt7u6YWnQ77L1cUVtY67o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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