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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52590b705396f81fcf72f2a7d6124f66828191f7595b6e28c5c489e02949cfd6' 
  AND token = 'c2F1uhT3FmEGg7wqKztU/N1zi4aot2GUU3n8cqG8Kg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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