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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a699b73161ddb3adc159546c86a1d2ec7637066d5d6a1dc1b0e0b025baceba5' 
  AND token = '0PWgm85PdI1nWOLMGMoq0+ojRTIRzMrz5XKduJSpCsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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