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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd6270b1dd3513747caf74344c6928a847b2ea8e6d7baf61c29ad5bd30e6d45' 
  AND token = '/HA+psdfWNpgEuXMz01UG/Qy6Yr0D4OQX/lnAgCGYu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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