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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f5244496011619f352fe211ae94ed82f2d873b0d82851ef59bc5f90e5a3a03' 
  AND token = '7ka/1D5q6Y9EQvy5J6NB9/v5QnQRsc7y2Yh5hDPpyN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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