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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e9ba05c784daee2100720f8b0f46f2186ba3d21e20dd8309d78f98849e980e' 
  AND token = '36xyry98ihMzpcBNYvcKTHp5BuZGXaemc/IG3LcQPIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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