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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85851a87fd9cb4112193f858fb821aa87102c4928f32ef6330a7af5cca606975' 
  AND token = 'NOP+w7hDKrlfeVTIavjcN027f/RgWIE6rCHeFU9x1Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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