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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8616b0d1482a5e406a1605287e2cb108f84d5781273af0483a9ace8ca72d26fb' 
  AND token = 'JWrRW/BbEAMTE08zC0d67BEcP/AbxEceADGlBV1FjOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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