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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09be0f62d119314a3eea76e394dc12be6dae7b598ab60836d0c6385cfab03b98' 
  AND token = 'c9gA4l9Tnyrmmnb+1+fyEZLpK60OWcNYgf/qhpXOHPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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