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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dec8964ebd03616f0b57895c9bad7687d9a366bbf535dbd978b0bb3703819a8' 
  AND token = 'OiuJT7ODLWwPH53Vvgn4nU3NEtEiX2VL40jswtU+9cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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