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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1898a5556f126d9d46b8f218b8f7f1c22f8394d97829e3fe44178f61726ccca8' 
  AND token = 'M+AkK0Nxr1FTOXl1ykXnR41C0SMA8Rp4Q4ThykR13y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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