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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793388320996627dc2fbd16aacaa5e2836d3606fac0758ba891b4bd307050edf' 
  AND token = 'c+Ss6efX6aHxzz/TH713D9vEUjaO4QliVfuLo57kS7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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