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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf50427d00603a9721bd387214639a603386e83c097bf46ee7526eb7084e159' 
  AND token = 'WGMOQwXFu01deK2jxasJ6ziQFLiUannTYY+KpF79L5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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