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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecaab946f8ac7b195697b8eaa49fef907ce71102aa24618568de9cef06b0d2d2' 
  AND token = 'wT0DAIhRWjcmb6tFYMhsny9sCylxspe7CJt1zWTd+GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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