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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7002652c851fcfdd4e9dde1d286b38676eb60d006d31961ecabaa8a7ac7437d9' 
  AND token = 'Ck/fW4Q8oGlBSh3Kbo3w+6ETlLzRucE0b/pPImWa8Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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