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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ba76b1e8366c96fc554b64ba458e7b6a670b7d8fd6dada04df6ca1630e44a3' 
  AND token = 'jN8c1Y+UA7DtY+ROui7tGwp0sW+6iHMt6UoPVn/bs7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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