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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90306c5939546d7615d03421adb74b657672b785f844442252dad378912bce9b' 
  AND token = 'kbonX/m2U3qgIZ8CfiKPDQC97c3oa5rUVD9tY0ngnA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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