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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7d9ccf68d5e9e47c93a747e79f48b3d50ade499f108acec7a9a1967584b038' 
  AND token = 'wIj1uurXAwsnin7B4nM23ZES2BH/9QIM9gq3+W9ufTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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