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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3d833085879434b03f2c2e12833c0f55fdfcb21c55583ab80c2a93f4c527aa' 
  AND token = 'gzif+nGXjy0uuDcDoNJ6i6dvVURV4Dx91iqnTk+LV4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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