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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01f2bfc103c0394e036c9e79fa39cf5b7bbdb2db05501b613f46d17bff68ab5' 
  AND token = 'lvxOBfDBucVHWXc3qYFU32Zr7esooU13BzRiO1p4Iyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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