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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1d6016841eb01260894fda7dc9e7e3175b5da3e503d097f0964fb878c6357e' 
  AND token = '1e9VLoo4yla14/kOEt6cdymTBI+TIwQU5SwMM1+WsvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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