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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e183b0d2807fab5add677e6a9970579bb8bb12d136df8811d6d5f65cb236931c' 
  AND token = 'N7NwpJHrzFx0o4Qv/aPhyeZGFN3HOSWz0TSlGrtwIbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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