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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96be490a3a8652b8a4261acf581d5df10e2e501cedfffa85acf08ffce91dc4c0' 
  AND token = '5Z+PCFPCeEl1xDL0fGM1Ebj08XoWYo/Bdm9+AKWUJZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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