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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1a495547f9f0a43fb6a33b8e47328d7d603087721ab56006afe3fcefb08df2' 
  AND token = 'di8xjQkqnkXUegPePf7rk1vJ3PoIgAHYU7NwXyNIiDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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