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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c1402c95fd4f3b3fadd2d261c89cf92dfec392de22900e1cfdc210905c82ed' 
  AND token = 'lDuDt9WafLaRZo3psd2jQmoZG1tXFcAbK0+Zx6cVOf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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