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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5753bf221465a52df18cd7d13ca2d065810f83b36c069c853a7864b0600d82' 
  AND token = 'iaCCAE5yIsceHbs2NgxVAsh3FeOGBr7EDWPfAut7E1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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