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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bec7d90872a72d6c00589371b6658d93341e0f0714a16175cd92fe2103527e7' 
  AND token = 'MTB8qXGq9OxJvTRh+6g61Rrxj/aUDF23JtI27efTUx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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