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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3371aa865bfaec279bb6b865c023e8690054b1d16dd92717607dd52ce4272b' 
  AND token = 'NBDRF0FEebf37CKw8l+zWygDbtzA3rANxk+GRfCn7aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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