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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8938c8b09f17d3ce20bd6094c4b4772512386a24d1b02215b87d3b5789341b3d' 
  AND token = 'TTOqF1I/KunPtT/JStlDStso70bL16pY3oAI3n8aK/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

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