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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b705459776ebf342c9cff0e6b48982861aea2959254030ac1194a23570f60c00' 
  AND token = 'HaeqNRH+3IlqaI0OCdgrxfbVFpa+mi9VlSo6UzNjn9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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